Here is another system I found here:
http://batintheattic.blogspot....s-ac-for-swords.html
Quilt +1 AC, -2 blunt
Soft Leather +1 AC
Hard Leather +2 AC, -1 Blunt, -1 Edge
The rigidity of boiled leather offer good protection against blunt weapons.
Ring +3 AC, +1 Blunt, -1 Edge, -2 Point
The metal rings on leather greatly improved protection against edged weapon. But it's flexibility makes it little better than soft leather, and no different for piercing weapons.
Scale +4 AC, +1 Blunt, -1 Edge, +1 Point
The scales increase armor protection overall especially against edged weapons, but it is flexible so while better than ring doesn't get the full benefit, and piercing weapons can slip in between scales with only the leather to stop it.
Mail +5 AC, +1 Blunt, -2 Edge, +2 Point
see above for comments
Banded +5 AC, +1 Blunt, -2 Edge
This represents various coats of plate, roman Lorica Segmentata, etc. Better than chain versus piercing weapons but more expensive.
Plate +6 AC, +1 Blunt, -3 Edge
Plate is the king of armor with superior protection to just about anything. Blunt weapons do the best as the broad impact allow the rigid metal to be bent more easily degrading the armor's ability to protect the wearer.
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Of course we have no plate in this game but it is a different take that has more to do with the armor itself than the weapon against a number.